An Emergency Department Diagnostic Protocol For Patients With Transient Ischemic Attack: A Randomized Controlled Trial

1. An Emergency Department Diagnostic Protocol For Patients With Transient Ischemic Attack: A Randomized Controlled Trial Michael A. Ross MD Scott Compton PhD Patrick Medado Philip Kilanowski MD Brian O’Neil MD Department of Emergency Medicine William Beaumont Hospital Wayne State University School of Medicine Funded by the Foundation for Education and Research in Neurological Emergencies (FERNE) and the Emergency Medicine Foundation (EMF)

2. Background • 300,000 TIAs occur annually • 10.5% suffer a stroke within 90 days of an ED visit • Stroke is preceded by TIA in 15% of pts • Stroke is the THIRD leading cause of death • National cost of stroke = $51 billion annually!

3. TIA STROKE

4. Management of TIA: • Areas of Certainty: • Need for ED visit, ECG, labs, Head CT • Areas of less certainty • The timing of the carotid dopplers • Areas of Uncertainty - Johnston SC. N Engl J Med. 2002;347:1687-92. • “The benefit of hospitalization is unknown. . . Observation units within the ED. . . may provide a more cost-effective option.”

5. Study Objective: To determine if emergency department TIA patients managed using an accelerated diagnostic protocol (ADP) in an observation unit (EDOU) will experience: • shorter length of stays • lower costs • comparable clinical outcomes . . . relative to traditional inpatient admission.

6. Methods An IRB approved prospective randomized study

7. Setting: • William Beaumont Hospital: A high-volume university-affiliated suburban teaching hospital • Emergency department • 2005 ED census = 115,894 • ED observation unit = 21 beds • Emergency physician - “admitting” physician for all patients

8. Patient population: • Presented to the ED with symptoms of TIA • ED evaluation: • History and physical • ECG, monitor, HCT • Appropriate labs • Diagnosis of TIA established • Decision to admit or observe • SCREENING FOR STUDY

9. Methods: Randomization • Patients were consented, then: • Sealed envelope opened - • Randomized to: • EDOU (ADP orders) • Inpatient bed (inpatient orders) • Data collection forms • Once randomized - primary care physician notified

10. Methods:TIA ADP Protocol • Developed by multidisciplinary group • Used for ~1 year prior to study • Target pathology being sought: • Crescendo TIAs or occult stroke • Paroxysmal atrial fibrillation, major arrhythmias • Carotid stenosis >50% • Intra-cardiac source of clot - (PFO, valves, etc.)

11. Methods:ADP Exclusion criteria • Persistent acute neurological deficits • Crescendo TIAs • Positive HCT • Known embolic source (including a. fib) • Known carotid stenosis (>50%) • Non-focal symptoms • Hypertensive encephalopathy / emergency • Prior stroke with large remaining deficit • Severe dementia or nursing home patient • Unlikely to survive beyond study follow up period • Social issues making ED discharge / follow up unlikely • History of IV drug use

12. Methods:ADP Interventions • Four components: • Serial neuro exams • Unit staff, physician, and a neurology consult • Cardiac monitoring • Carotid dopplers • 2-D echo • BOTH study groups had orders for the same four components

13. Methods:ADP Disposition criteria • Home • No recurrent deficits, negative workup • Appropriate antiplatelet therapy and follow-up • Inpatient admission from EDOU • Recurrent symptoms or neuro deficit • Surgical carotid stenosis (ie >50%) • Embolic source requiring treatment • Unable to safely discharge patient

14. Methods:90-day Study Follow Up • Methods: • Structured telephone interview • Electronic records review • Paper chart review • Recidivism: • Related return visit to ED or hospitalization • Scheduled or unscheduled • Not routine office or clinic visits

15. Methods:Study Outcome Measures • Length of stay • ED arrival to hospital discharge • 90-day Total Direct Cost • Index visit costs + 90-day related costs • “EPSi” – hospital cost accounting system • Professional costs not included • Clinical outcomes - stroke, recidivism

16. Statistical Methods • Power analysis: • The study sample size had a “strong” power (.80) to detect a 25% absolute difference in the primary outcome of length of stay. • equivalent to 24 hours • Analysis: • Univariate and descriptive statistics used • Difference between medians estimated by the Hodges-Lehmann method

17. Results

18. Results:PatientCharacteristics

19. Results:Performance of clinical testing

20. Results:Length of Stay Median Inpatient = 61.2 hr ADP = 25.6 hr Difference = 29.8 hr (Hodges-Lehmann) (p<0.001) ADP sub-groups: ADP - home = 24.2 hr ADP - admit = 100.5 hr

21. Results:90-Day Clinical Outcomes

22. Results:90 - day Costs Median Inpatient = $1548 ADP = $890 Difference = $540 (Hodges-Lehmann) (p<0.001) ADP sub-groups: ADP - home = $844 ADP - admit = $2,737

23. Cost distribution

24. Limitations and Issues: • Limitations: • Not powered for individual clinical outcomes • Single center, EDOU • May not be applicable outside the EDOU • Future Issues: • ADP for small strokes (NIH <3)?

25. Implications • National feasibility of ADP: • 18% of EDs have an EDOU • 220 JCAHO stroke centers • National health care costs • Potential savings if 18% used ADP: • $29.1 million dollars • Medicare observation APC • Impact of shorter LOS • Patients – satisfaction, missed Dx . . . • Hospitals – bed availability

26. Summary: A diagnostic protocol for TIA in an EDOU is more efficient, less costly, and demonstrated comparable clinical outcomes to traditional inpatient admission.

27. Acknowledgements • FERNE / EMF • Beaumont research staff and residency

28. Questions?